There’s definitely a good case to be made for something like this, but just wanted to flag early comments to avoid any confusion down the line, and focus on a productive discussion:
$280m is counting LDO at current market values. This is bad practice, highly misleading and does not reflect the actual value of the treasury. The treasury currently has 20k ETH, 10.7k stETH, 10.3m DAI and 2.3m USDT. Please stop counting the value of LDO in treasury. We rely on @Hasu mental model for treasuries as an illustration of the reasoning.
Regarding the budget, the post you link to is almost a year old and was a draft. Since then there have been several actual budget requests that have come and gone. The currently approved budget requested $24m through to the end of the year. Much of this is for audits for further Lido v2 developments including the Staking Router and Dual Governance.
Other than that, look forward to a fruitful discussion for this interesting proposal. We will give it some thought too and provide our views.